工具方法：判断是否为空获取手机Imei编号等

public static boolean isEmpty(String s) {
if (null == s)
return true;
if (s.length() == 0)
return true;
if (s.trim().length() == 0)
return true;
return false;
}

// 校验Tag Alias 只能是数字,英文字母和中文
public static boolean isValidTagAndAlias(String s) {
Pattern p = Pattern.compile("^[\u4E00-\u9FA50-9a-zA-Z_!@#$&*+=.|]+$");
Matcher m = p.matcher(s);
return m.matches();
}

// 取得AppKey
public static String getAppKey(Context context) {
Bundle metaData = null;
String appKey = null;
try {
ApplicationInfo ai = context.getPackageManager().getApplicationInfo(
context.getPackageName(), PackageManager.GET_META_DATA);
if (null != ai)
metaData = ai.metaData;
if (null != metaData) {
appKey = metaData.getString(KEY_APP_KEY);
if ((null == appKey) || appKey.length() != 24) {
appKey = null;
}
}
} catch (NameNotFoundException e) {

}
return appKey;
}

// 取得版本号
public static String GetVersion(Context context) {
try {
PackageInfo manager = context.getPackageManager().getPackageInfo(
context.getPackageName(), 0);
return manager.versionName;
} catch (NameNotFoundException e) {
return "Unknown";
}
}

public static String getDeviceId(Context context) {
String deviceId = JPushInterface.getUdid(context);

return deviceId;
}

public static void showToast(final String toast, final Context context)
{
new Thread(new Runnable() {

@Override
public void run() {
Looper.prepare();
Toast.makeText(context, toast, Toast.LENGTH_SHORT).show();
Looper.loop();
}
}).start();
}

public static boolean isConnected(Context context) {
ConnectivityManager conn = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);
NetworkInfo info = conn.getActiveNetworkInfo();
return (info != null && info.isConnected());
}

public static String getImei(Context context, String imei) {
try {
TelephonyManager telephonyManager = (TelephonyManager) context.getSystemService(Context.TELEPHONY_SERVICE);
imei = telephonyManager.getDeviceId();
} catch (Exception e) {
Log.e(ExampleUtil.class.getSimpleName(), e.getMessage());
}
return imei;
}